Weird boost issue
 

Hi all, I have a single turbo fd making around 380-400 wheel at 14-15 pounds of boost. I got it tuned about a week ago and everything was working fine I was making the right amount of boost after some adjustment of the boost solenoid. Then after like 2 days now i can only make a max of 13 pounds and it drops to like 10-11 once I get near the redline which is 8k rpm. I looked over the exhaust and the whole charge pipe and couldn't find a boost leak. So I went into haltech and turned up the boost in the midrange and also the peak boost at 8k rpm. when I drove the car I could feel that the boost came on faster but still only peaked at 13 and then began to drop. I have some logs I'll include too for anyone who uses haltech. I cant figure out whats causing this there is not obvious leak in the charge pipe and nothing from what I can tell is wrong with the exhaust either. if anyone has encountered an issue like this please let me know I am going to check everything over again today to make sure I am not missing something. ill upload the log to google drive since it wont let me upload the file here.
link to autolog: https://drive.google.com/file/d/1yoa...ew?usp=sharing

Warmer weather, collapsing intake, dirty filter, collapsed catalyst, flex tube or muffler, failed exhaust/turbine gasket.

Have you checked all the wastegate lines and how is the gate diaphragm plumbed/vented?

Rag in the intrrcooler is always a good one.

I'll have to dig out a personal laptop one day so I can actually look at ecu files and logs.

Waste gated is plummed and all the lines to it are intact. I might as well take all the tubing off and put it on so I know that's not the issue. What concerns me the most is that before this problem occurred the settings I put into haltech would have caused 18 psi or more but the car wont go above 14. there also may be a crack in the exhaust manifold so that's no bueno. Appreciate all your ideas.
https://cimg4.ibsrv.net/gimg/www.rx7...9392336eef.png
The crack you see in this photo is on the bottom of the exhaust manifold. cant tell if its a crack in the weld that holds the two pipes together or if its a crack in the actual pipe.

That could definitely do it.

appears to have split on the edge of a weld seam

do you have a zoomed back picture of it to help provide a more full view of the manifold and what we’re looking at?
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Time to go single turbo way overdo!